Abstract: Transient surface wave test is a type of geotechnical engineering field test.It use the dispersion and speed information which produced by the surface wave in one wavelength range spreading in different soil and rock medium.Through the test software,to synthesize as a surface wave section profile color image that reflect the characteristics of stratum elastic structure,in order to interpret the difference in wave velocity.This article takes an Seychelles project as an example to discuss the engineering practice that in the case of being lack of exploration work space,difficult to identify the strata just with simple exploration ways,using the transient surface wave test comparing with engineering exploration data.Meanwhile,the article briefly analyzes the advantages and limitations according to the situation that we using the transient surface wave test on site.